Non-possessiveness, non-acquisitiveness. Abstention from greed for worldly possessions.
The fifth vow of the Mahavrats (great vows)
"The fruit of non-possessiveness is alert awareness. Unconsciousness is bondage. An attached mind cannot be introversive. It remains identified with both body and matter. The thicker the layers of attachment, the more densely is purity clouded. In order to dissolve the layers of attachment, it is necessary to strengthen through constant practice the spirit of non-possessiveness."